Switched reluctance motor power converter current ratio integral mean value difference fault diagnosis method
A technology of switched reluctance motor and power converter, applied in the direction of motor generator testing, etc., can solve the problems of increasing the cost of implementing diagnosis, reducing the feasibility of implementation, etc., achieving good feasibility, enhancing diagnostic accuracy, and simple diagnostic process. Effect
Active Publication Date: 2017-11-17
CHINA UNIV OF MINING & TECH
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Problems solved by technology
Under current hysteresis control, the reference current and phase current changes are obviously different when open-circuit and short-circuit faults occur in the switched reluctance motor system. At the same time, the reference current and phase current will be affected by different load torques and speeds. Therefore, it is necessary to study a fault diagnosis method that is robust to load torque and speed, simple in the diagnosis process, accurate and effective. solve the above problems
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[0025] The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:
[0026] Taking the asymmetrical half-bridge power converter under the current hysteresis control mode of the three-phase 12 / 8 switched reluctance motor as an example to continue fault diagnosis, the topology of the asymmetrical half-bridge power converter is as follows figure 1 As shown, the proposed diagnostic method can also be used in such figure 2 Shown is a dual-winding topology power converter. Each phase current is measured using a current sensor i n ( n = A , B , C ) for detection, A , B , C The phase currents are i A , i B , i C , the current phase sequence is " A-B-C ".
[0027] The implementation process of the proposed fault diagnosis method is as follows: image 3 shown. First, determine the definition method of the fault diagnosis feature quantity: in the case of current hysteresis control, the phase current i n an...
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The invention belongs to the technical field of motor drive system fault diagnosis technologies, and provides a switched reluctance motor power converter current ratio integral mean value difference fault diagnosis method. The method diagnoses main switching tube open circuit and short circuit fault types of a switched reluctance motor power converter under a current hysteresis control, first a current ratio coefficient i<rn> of reference current i<ref> and phase current i<n> of each phase is calculated, then an integral average value i<rn_av> of the current ratio coefficients i<rn> of the phases in a rotor cycle is calculated, a deviation coefficient i<dn> of the integral average value of the phases is used as a diagnosis characteristic quantity, and a corresponding diagnosis characteristic quantity judgment threshold value and diagnosis rules are set, thereby realizing determination of the fault type of the power converter main switching tube. The proposed fault diagnosis method has good robustness, does not need to add an extra sensor, at the same time, an n-phase motor has n corresponding diagnosis characteristic quantities, thus diagnosis precision can be improved and occurrence of false diagnosis can be prevented, and the fault diagnosis method is suitable for fault diagnosis of power converters of different phase numbers and different topologies, and has good engineering application value.
Description
technical field [0001] The invention relates to a fault diagnosis method for the current ratio integral mean value difference fault of a switched reluctance motor power converter, especially applicable to switched reluctance motor power converters with various phase numbers, various topological structures and different power levels. Background technique [0002] The power converter is the key link in the energy conversion of the switched reluctance motor system, and its normal operation is the basis for realizing the high reliability operation of the system. Effective fault diagnosis for power converters can provide an effective guarantee for the implementation of fault-tolerant control, and accurate and reliable fault diagnosis methods can also avoid further propagation of faults, reduce system maintenance costs, and improve system operation economic benefits. Under current hysteresis control, the reference current and phase current changes are obviously different when open...
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IPC IPC(8): G01R31/34
CPCG01R31/34
Inventor 陈昊杨剑徐帅唐琛陈祖鸿任兴金凯丰端木子昂
Owner CHINA UNIV OF MINING & TECH